Michael Cassidy

Michael or Mike Cassidy may refer to:
 * Michael Cassidy (Canadian politician) (born 1937)
 * Michael E. Cassidy (born 1955), Pennsylvania politician
 * Michael Cassidy (actor) (born 1983), American film and television actor
 * Michael Cassidy (sailor) (1837–1908), American Civil War sailor and Medal of Honor recipient
 * Mike Cassidy (entrepreneur), American entrepreneur; CEO and co-founder of Internet start-ups
 * Mike Cassidy (Canadian football) (1926–2011), American and Canadian football player
 * Mick Cassidy (born 1973), English rugby league player
 * Michael Cassidy (evangelist) (born 1936), South African Christian evangelist